The glassworks created large numbers of its own new designs of iridescent, trailing art nouveau glass, sometimes in collaboration with well-known artists and designers like Marie Kirschner and Franz Hofstötter (aka Franz Hofstätter). The zenith of Loetz art nouveau glass was epitomized by the so-called Phänomen series of designs, much of it designed by Hofstötter, which won a Grand Prix (alongside Tiffany, Gallé, Daum and Lobmeyr) at the Paris World’s Exposition in 1900.
The company’s success during this period had two prime drivers – the technical expertise of Prochaska and the business acumen of von Spaun. Loetz Witwe created many of its own designs, and also supplied glass commissioned by major customers like E. Bakolowits (Vienna) and Max Emanuel (London).